I see people trying to unload their uber-special Marilyn collections on craigslist here all the time. Some think they're worth even more than that. I just have to laugh.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .